Development of highly c-axis oriented iron-nitride nano-magnet assembly

Research Project

Project/Area Number	23510114
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Research Field	Nanostructural science
Research Institution	Tohoku University
Principal Investigator	OGATA Yasunobu 東北大学, 未来科学技術共同研究センター, 教育研究支援者 (40509717)
Project Period (FY)	2011 – 2013
Project Status	Completed (Fiscal Year 2013)
Budget Amount *help	¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000) Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000) Fiscal Year 2012: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000) Fiscal Year 2011: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords	クラスター・微粒子 / 磁性ナノ粒子 / 窒化鉄 / 配向制御
Research Abstract	Synthesis for single-phase formation of iron-nitride nano-magnet and fabrication of iron-nitride nano-magnet assembly using an applied external magnetic field during a solidification process were performed. By optimizing synthesis conditions and preventing surface from oxidation, iron-nitride nano-magnet with single-phase of alpha-double-prime-Fe16N2 was successfully synthesized, and 233 emu/g of magnetization was obtained at 70 kOe and at 5 K. External magnetic field during the solidification process brought about magnetic anisotropy of the assembly. However, not only crystalline orientation but also nano-structure has to be taken into account for realizing high performance iron-nitride nano-magnet assembly.